Boss 302
02-10-2006, 06:32 AM
#1
2nd Gear Member
Thread Starter
Join Date: Oct 2005
Posts: 223
Boss 302
I was considering puting some Cleveland heads on my 302... I have some heads off a 400 or 351M and was wondering what had to be done to the heads/block to pull this off. I know I'll need a different intake and all but I was just wondering about the heads. I want to do it for a naustalgic effect and also to see those massive heads on a 302... Thanks in advance.
02-10-2006, 12:17 PM
#3
2nd Gear Member
Thread Starter
Join Date: Oct 2005
Posts: 223
RE: Boss 302
Yeah I heard they needed to be drilled out to match the 302's block water passages... just seein if there was something else or if that was it... and also which passages need the drilling.. Also does anyone know the combustion chamber cc's of a Cleveland style head?
02-10-2006, 12:34 PM
#4
1st Gear Member
Join Date: Dec 2005
Location:
Posts: 128
RE: Boss 302
Cleveland Heads on Windsor blocks.
To allow for the differences in coolant flow between the 351C heads and the 289/302/351W blocks, makes these simple modifications. Because the 351C has a dry intake manifold, coolant doesn’t flow between the head and the manifold, flowing instead through the block-mounted thermostat. With the 289/302/351 Windsor engines, coolant flows from the head into the intake manifold where it flows through the manifold-mounted thermostat. The first 351C head modification is to bore a hole in the head (A) to allow coolant flow into the 289/302/351W intake manifold. Bush Performance closes off the cooling passage between the head and block by making a round hole out of a square hole. Then it plugs the round hole with a freeze plug (B). Additional water jacket holes are drilled in the block as shown for better cooling.
To allow for the differences in coolant flow between the 351C heads and the 289/302/351W blocks, makes these simple modifications. Because the 351C has a dry intake manifold, coolant doesn’t flow between the head and the manifold, flowing instead through the block-mounted thermostat. With the 289/302/351 Windsor engines, coolant flows from the head into the intake manifold where it flows through the manifold-mounted thermostat. The first 351C head modification is to bore a hole in the head (A) to allow coolant flow into the 289/302/351W intake manifold. Bush Performance closes off the cooling passage between the head and block by making a round hole out of a square hole. Then it plugs the round hole with a freeze plug (B). Additional water jacket holes are drilled in the block as shown for better cooling.
Originally quoted at http://www.strokerengine.com/ClevelandHeads.html
02-10-2006, 06:05 PM
#8
Yukon Cornelius
Join Date: Oct 2005
Location: deep in the heart of dixie GEORGIA
Posts: 11,808
RE: Boss 302
would need boss 302 pistons to keep the compression up just order the new edelbrock clevlands heads they bolt on no mods to water passages cause its already done for u and it has the quench combustion chamber and the 2v ports for the perfect street head or if ur really on a budget find some aussie 2v heads they also have the quench chamber!
02-11-2006, 12:27 AM
#9
5th Gear Member
Join Date: Aug 2004
Location: ABQ, NM, USA
Posts: 2,593
RE: Boss 302
The new Edelbrock heads have passages for either way, but you would still need to drill holes in your block IIRC. At least I did using 2V C heads on my 351W Block. 10 years ago, this made sense, but there are better options now.
02-11-2006, 12:50 AM
#10
5th Gear Member
Join Date: Aug 2004
Location: Arizona
Posts: 4,103
RE: Boss 302
Speed Pro was making new, forged pistons several years ago just for 302's with Cleveland heads. They even named them 'Clevors'.
If I remember right they made them in a couple differant compressions too.
That set-up is doable, I've even lusted about it myself.....
If I remember right they made them in a couple differant compressions too.
That set-up is doable, I've even lusted about it myself.....