heads
07-30-2006, 11:52 PM
#5
5th Gear Member
Join Date: Mar 2006
Location: Greenville SC
Posts: 2,317
RE: heads
your going to need a pretty big cam and some nicely ported heads to make around 350hp. But its do-able. Ive seen budget motors with ported 289/302 heads make around 350hp N/A. Its possible, you just got to pick your parts very carefully and go the extra mile. Doing it carb'd would be easier than making it with EFI, along with a hell of alot cheaper.
Carb'd you would need something along these lines...
Heavily ported E7's, with Manley Race flow valves, like about 1.84/1.54 or something a little bigger.
about a .530lift/228-230 0.50 duration. Or somewhere along those lines on the cam, a custom cam would be preferred but if your on a budget its not going to fit in.
Just some 1.6 aluminum rockers.
A vic Jr intake or something comparable, gasket matched, maybe even extrude honed.
A 600cfm Demon carb. Holleys are good to but you'll probably loose 3-5hp with one.
Some long tube headers, 1 5/8 or so primaries, get the tubes to big and your going to hurt low end torque, shorties are good to but long tubes are almost always preferred.
And there are a ton of little things that need doing, but the heads are going to be the biggest draw back, your going to need to work on them a good bit. You could find some GT40's for cheap, about $250 a set and put the biggest Manley race flow valves that will fit, i believe 2.02 intake and 1.60's will fit, but not sure, those may hurt the low end torque a little more but they're going to be needed. If you do that i think you will be much happier, ive seen flow numbers on GT40's with a stage III port job and race flow valves flow 240's on the intake and 205 or so on the exhaust side. But a good set of aluminum heads will already be over those. SO....its all about the size of your wallet...there is no replacement for cubic dollars.
Carb'd you would need something along these lines...
Heavily ported E7's, with Manley Race flow valves, like about 1.84/1.54 or something a little bigger.
about a .530lift/228-230 0.50 duration. Or somewhere along those lines on the cam, a custom cam would be preferred but if your on a budget its not going to fit in.
Just some 1.6 aluminum rockers.
A vic Jr intake or something comparable, gasket matched, maybe even extrude honed.
A 600cfm Demon carb. Holleys are good to but you'll probably loose 3-5hp with one.
Some long tube headers, 1 5/8 or so primaries, get the tubes to big and your going to hurt low end torque, shorties are good to but long tubes are almost always preferred.
And there are a ton of little things that need doing, but the heads are going to be the biggest draw back, your going to need to work on them a good bit. You could find some GT40's for cheap, about $250 a set and put the biggest Manley race flow valves that will fit, i believe 2.02 intake and 1.60's will fit, but not sure, those may hurt the low end torque a little more but they're going to be needed. If you do that i think you will be much happier, ive seen flow numbers on GT40's with a stage III port job and race flow valves flow 240's on the intake and 205 or so on the exhaust side. But a good set of aluminum heads will already be over those. SO....its all about the size of your wallet...there is no replacement for cubic dollars.
Thread
Thread Starter
Forum
Replies
Last Post