tmoss said:I't about area under the whole curve - not just the low end. A professionally ported Performer will carry farther than 4,000 rpm on a 347. Try it. Just don't expect to use it above 6,000-6,500 rpm and make the best power - you need more cross section then.
A custom cam, within limits, can crutch a combo with some mismatch.
Rick's suggested intake will also make excellent power in a different area of the curve - a carb intake does not have the runner length restriction and EFI does and they give up some low end which is not an issue on a race car. May not ber an issue on the street either if you retain sufficient torque to move the car's weight off-idle.
Let me spell this out for some of you:
A 347 with a 290+ .006" duration cam that are going to spin a 347 above 6,500 RPM need a runner length that is approximately 12" in length with ~ a 2.6-2.7 sq.in cross section along with an 80mm TB. A Victor EFI would work well here.
A 347 with a 280- .006" duration cam that are going to spin a 347 no higher than 6,500 rpm need a runner length of approximately 14.5" with ~ a 2.4 sq.in cross section and a 75mm TB. A ported Performer fits this bill perfectly.
90mustangGT said:I don't plan on spinning over 7Krpm. Ed Curtis or Jay Allen for the cam. Did you have to angle mill the intake to make it work? The reason I am thinking solid roller is because the block I have is a non-roller. I talked to Rick and e-mailed Jay Allen, as well as other engine builders, and they said or agreed that solid roller is the way to go and worth the extra price. A solid roller doesn't have to be any more agressive than a hydro. I still might run a solid flat cam, depending on budget. Making money like I have been the past few weeks (shop has been balls to the wall) then it's all out, but most likley it will slow down.
Right now I have a Edelbrock Perfomer EFI. That's just not going to cut it for my goals. I plan to sell it, hopefully get $300 or so for it, and put it towards something bigger. I want something with growing room.
blackstangt said:Blocks are easy to come by, try getting a roller block, also, the typhoon intake is supposed to be exactly the same as the performer rpm, so it would be a step up, and you can get it for like 300. I have it and besides timing difficulty and lack of oil shield for the lower, it works perfectly... it way even be a little too high rpm for my setup(better for yours), but works really well.
tmoss said:Let me spell this out for some of you:
A 347 with a 290+ .006" duration cam that are going to spin a 347 above 6,500 RPM need a runner length that is approximately 12" in length with ~ a 2.6-2.7 sq.in cross section along with an 80mm TB. A Victor EFI would work well here.
A 347 with a 280- .006" duration cam that are going to spin a 347 no higher than 6,500 rpm need a runner length of approximately 14.5" with ~ a 2.4 sq.in cross section and a 75mm TB. A ported Performer fits this bill perfectly.
Grn92LX said:Heres another graph I have on my pc of a 347 with TW heads, R manifold, 1 3/4" longtubes, 3" exhaust and a buddy rawls custom solid roller designed for low rpm torque. This graph does the opposite of what most would think with these "big" parts. Here it is:
Grn92LX said:Sounds like a badd ass machine manToo bad you're down south, would be fun to line up with ya.
Theres plenty of good places that can work those twisted wedges, I did my HW on that
What assembly did you go with?
90mustangGT said:I went the the same setup you have basically, The Scat 9000 crank, probe 5.315 (I think, not the 5.4) same pistons you have. I got the 28oz Poineer balancer and the Spec billet steel flywheel too. Rick is going to balance everything.
Looking up about twisted wedge porting, some good places out there no doubt. I will probally go with thumper because I was so impressed with what he did with E7's, and it wouldn't be his first pair.
Love to race, will travel, you never know.
90mustangGT said:Yeah, I forgot about you went with the lighter weight parts.I would have gone that route if I wasn't going full drag. I am going to look into other head porting places as well, just haven't yet. CNC is awesome, but the work is no better than the programmer.
If I travel that far, I'll be sure to have a plate that will be perfect fit for your ass!!! Don't forget, in the south, we tend to overcook things into soggy messes!!!!!!!!
90mustangGT said:Yeah, I forgot about you went with the lighter weight parts.
90mustangGT said:Yeah, I forgot about you went with the lighter weight parts.I would have gone that route if I wasn't going full drag.
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