budget build 302 to 347 stroker
12-13-2009, 12:16 AM
#11
Banned
Join Date: Dec 2005
Location: Lil' Rhody
Posts: 22,376
i myself am slowwwwly putting together my plans for my engine...
i'm planning to do a 331, NOT a 347... what research i've done says that stroking to 347 leaves such short pistons that you compromise the o-rings and the integrity of the piston head... 302->347 stroker is short-lived compared to a 302->331. anyone who has information to the contrary please correct me.
from what i've found out so far, it looks like it's going to cost me $4k-$5k to build an engine myself, slowly and meticulously, in my garage.
my first stop is going to be 3.73's, a new trak-lok, and 31-spline axles in the spring.
then a tko-600 trans... chassis reinforcements... ultimately engine build.
do it slow and do it right
.
i'm planning to do a 331, NOT a 347... what research i've done says that stroking to 347 leaves such short pistons that you compromise the o-rings and the integrity of the piston head... 302->347 stroker is short-lived compared to a 302->331. anyone who has information to the contrary please correct me.
from what i've found out so far, it looks like it's going to cost me $4k-$5k to build an engine myself, slowly and meticulously, in my garage.
my first stop is going to be 3.73's, a new trak-lok, and 31-spline axles in the spring.
then a tko-600 trans... chassis reinforcements... ultimately engine build.
do it slow and do it right
.see if you come back with your head
12-13-2009, 01:08 AM
#12
there is absolutely no difference in reliability or life span when comparing a 331 to a 347. the things you found must be from years ago, when that used to ahve some truth to it.
and to the o.p.
i agree with other people. don't touch the lower end until you have more money. I'd swap the h/c/i out for some nice used aluminum heads, get your decent sized cam, and an intake and other miscellanious pieces. fing it all used for good prices you can keep it to 2 grand and still come out with about 300 whp.
and to the o.p.
i agree with other people. don't touch the lower end until you have more money. I'd swap the h/c/i out for some nice used aluminum heads, get your decent sized cam, and an intake and other miscellanious pieces. fing it all used for good prices you can keep it to 2 grand and still come out with about 300 whp.
12-13-2009, 02:02 AM
#13
6th Gear Member
Join Date: Dec 2003
Location: United States
Posts: 9,587
i myself am slowwwwly putting together my plans for my engine...
i'm planning to do a 331, NOT a 347... what research i've done says that stroking to 347 leaves such short pistons that you compromise the o-rings and the integrity of the piston head... 302->347 stroker is short-lived compared to a 302->331. anyone who has information to the contrary please correct me.
from what i've found out so far, it looks like it's going to cost me $4k-$5k to build an engine myself, slowly and meticulously, in my garage.
my first stop is going to be 3.73's, a new trak-lok, and 31-spline axles in the spring.
then a tko-600 trans... chassis reinforcements... ultimately engine build.
do it slow and do it right.
i'm planning to do a 331, NOT a 347... what research i've done says that stroking to 347 leaves such short pistons that you compromise the o-rings and the integrity of the piston head... 302->347 stroker is short-lived compared to a 302->331. anyone who has information to the contrary please correct me.
from what i've found out so far, it looks like it's going to cost me $4k-$5k to build an engine myself, slowly and meticulously, in my garage.
my first stop is going to be 3.73's, a new trak-lok, and 31-spline axles in the spring.
then a tko-600 trans... chassis reinforcements... ultimately engine build.
do it slow and do it right
.go ahead make less power with a 331.. one more mustang on the road for me to wax..!
Last edited by primetime5.0; 12-13-2009 at 02:06 AM.
12-13-2009, 10:31 AM
#15
5th Gear Member
Join Date: Jan 2006
Location: Puerto Rico
Posts: 3,926
i myself am slowwwwly putting together my plans for my engine...
i'm planning to do a 331, NOT a 347... what research i've done says that stroking to 347 leaves such short pistons that you compromise the o-rings and the integrity of the piston head... 302->347 stroker is short-lived compared to a 302->331. anyone who has information to the contrary please correct me.
i'm planning to do a 331, NOT a 347... what research i've done says that stroking to 347 leaves such short pistons that you compromise the o-rings and the integrity of the piston head... 302->347 stroker is short-lived compared to a 302->331. anyone who has information to the contrary please correct me.
information. Why?..... 1. One of the 347 stroker configs (3.4" stroke and 5.315" rod), if piston comp height is that crucial to you, uses the same piston the 331 stroker setup uses. So how could the piston be "short" for a 347 and not for a 331?
2. 347 stroker longevity misinformation is not due to the setup, it is due to bad engine building practices.
12-14-2009, 09:24 AM
#17
2nd Gear Member
Join Date: Jul 2009
Location: NJ
Posts: 189
Allow me then......... that is simple information. Why?.....
1. One of the 347 stroker configs (3.4" stroke and 5.315" rod), if piston comp height is that crucial to you, uses the same piston the 331 stroker setup uses. So how could the piston be "short" for a 347 and not for a 331?
2. 347 stroker longevity misinformation is not due to the setup, it is due to bad engine building practices.
information. Why?..... 1. One of the 347 stroker configs (3.4" stroke and 5.315" rod), if piston comp height is that crucial to you, uses the same piston the 331 stroker setup uses. So how could the piston be "short" for a 347 and not for a 331?
2. 347 stroker longevity misinformation is not due to the setup, it is due to bad engine building practices.
2) This is exactly why I'm not starting on mine yet - the more I know before I start blowing money on components, the better. I'm planning for this to be a slow, careful and meticulous process.
I love the info I get on these forums.
12-14-2009, 09:55 AM
#18
5th Gear Member
Join Date: Jan 2006
Location: Puerto Rico
Posts: 3,926
FYI....... here's a 331/347 short rod piston. Look at the crown and top of ring land. 1.175" Compression Height, .195" Deck Thickness
Here's the 347 long rod piston 1.090" comp. height, .225" deck thickness.
Again... the "integrity" of the piston is not compromised, they are set a little different...... that's all. Shortening of the piston compression height is to keep everything within the deck height boundary, not for valve clearance problems.
Here's the 347 long rod piston 1.090" comp. height, .225" deck thickness.
Again... the "integrity" of the piston is not compromised, they are set a little different...... that's all. Shortening of the piston compression height is to keep everything within the deck height boundary, not for valve clearance problems.
12-14-2009, 11:56 AM
#19
Join Date: Dec 2009
Location: Indiana
Posts: 15
www.propowerparts.com sells a 331 stroker kit for$775. You can get a set of pro comp 190cc aluminum heads on ebay for around $600 new and I would go with a Comp Extreme energy 274 hydraulic roller cam (.555/.565 lift). $249 at summit racing. Muscle Mustangs and Fast Fords magazine did an article on the pro power 331 stroker kit and it installed with no block clearancing needed. Hop this helps.
12-14-2009, 12:16 PM
#20
6th Gear Member
Join Date: Dec 2003
Location: United States
Posts: 9,587
www.propowerparts.com sells a 331 stroker kit for$775. You can get a set of pro comp 190cc aluminum heads on ebay for around $600 new and I would go with a Comp Extreme energy 274 hydraulic roller cam (.555/.565 lift). $249 at summit racing. Muscle Mustangs and Fast Fords magazine did an article on the pro power 331 stroker kit and it installed with no block clearancing needed. Hop this helps.
