351c Funnelweb intake manifold dyno comparison.
I'm running a Funnel Web with the port stuffers. in my drag car, 87 hatch back. My best ET 10.7 @124mph. My 60' is a 1.48 with a c4 trans and a 4500 stall with a trans break. 430 gears and a 28.5 tire. We started out with 410s and we found out that wasn't near enough. 456's are going in now. We were in the 1.58 with the 410's. I'm launching at 3500 because of traction problems, that I hope to have fixed for next year. We basically had a stock rear suspension with Lakewood traction lift bars. All of last year we basically had a stock car, nothing fancy.
The engine combo consists of a $400.00 short block that I picked up on ebay last winter. .030 over with TRW flat tops and a comp cam 294s. I pulled the flat tops out and dropped in a set of used TRW domed pistons. Stock rods, and I filled the block. The spec for the cam is embarrassing by Cleveland drag race standards, 248 duration @ .050 .605 gross lift intake and exhaust. I never planed on spinning it over 6500 so last year I didn't even have the rotating ass. balanced. I can brag about that now because it came apart looking as though it was all new. It's getting balanced for next year because we're taking it up to 7000 or maybe 7200. Here is the weird thing, at about 6200 it feels like you're hitting a button of nitrous, or opening up another four barrel. I couldn't believe this the first time it happened. I have it on tape from inside the car and the engine changes pitches like you're hitting the button. All summer long there where people coming up and asking where the bottle was after we blew by them the last 50' of track and put them on the trailer.
I know a few people don't believe the port volume of the funnel web will support the Cleveland heads at higher rpm's. But I have it on tape. I have had that pull from running a Weiand tunnel ram on a comparable Cleveland just with more cam. However, the power pull was more of a slower increase. It wouldn't even touch what the funnel web pulls from 3500 to 6200. The low end pull and increase from the funnel web is unbelievable. I also believed that you had to run a Holley Strip dom If you wanted to run a single four barrel. I have run this intake on a few street engines that went to the track about 10 times a year. I'm not going to say anything bad about the Holley, there are guys still running them with good results. However, I feel you have to run the engine at a higher rpm to achieve the same out-put. With the port stuffers I don't believe any thing will touch the funnel web down low off the line.
Next year I'm planning on a new cam, carb, and higher gear. The front end getting a tube K member, coil overs, and the rear getting roll bar with drag shocks and springs. Cam will be a comp custom grind, 252-262 @ .050 .657 gross lift. I've already talked to Jessie at Biggs's about the size carb I should run. The 830 HP was way to small even for what I had in the cam department. To fill the intake I had to run one 50cc squirter for off the line when we were on the foot break. To keep the plugs a nice light brown I ended up jetting well into the 90's. I guess I'll be looking at a 950 or a 1050 HP for next year.
I'd like to get one of these Funnel webs on my 393 stroker Cleveland in my 69 Boss to see what that would do