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SBF head recommendation with F2

5377 Views 14 Replies 11 Participants Last post by  txag01
When I started building my 64 fairlane, it was going to be a 408w, with AFR 205 nitrous port heads, a 250 shot fogger, and a 4 speed. After bench racing, and too many beers, my power desires have changed.

My goal for the car is an 80% street driven, 93 octane pump gas car that will run close to an 8.50 quarter. I drew the line at 8.50 because I don't want to put a F/C cage in the car.

I am now planning on a 427W, with a procharger 1500 hp A/A intercooler, F2 side slinger, a C&S blow thru, and a built AOD w/ 4r70w gearset. The car has a mustang II front, ladder bar rear, and is mini-tubbed to a fit a 12.5” wide tire. The car also has a glass trunk, hood, fender, bumpers, and will soon get glass doors. I don’t know about weight yet, but I am hoping for about 3200lbs + driver.

I have acquired a Dart 4.0 bore IE block, a lunati pro series 4.0 stroke crank, Lunati 6.2 pro billet rods, the F2, the blow thru, the intercooler, a edelbrock super victor 9.5 deck intake, the AOD, and a 3.25 gear 35 spline lenco locker 9” in a strange case.

I also have a new set of AFR 205 heads with the larger 80cc exhaust, and a set of jesel sportsman 1.6 rockers to go with them and a set of Kooks 2" primary headers with AFR flanges that I was going to make fit.

I have not purchased pistons or a cam.

I had originally thought that stepping to an AFR 225 with 72cc chambers would be enough head and allow me to use the headers and roller rockers and have large enough chambers to keep the compression down. After doing some research here, it appears that I may be better off with a different set of heads.

I would like to get some recommendations for heads, valves, springs, lifters, cam, and compression ratio. This is my first boosted car, so any other info is greatly appreciated. I purchased Steve’s video’s to get me started, but my head is spinning with questions.
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Heads aside you have to figure out how hard you plan to turn the motor vs blower speed. The next problem will be slowing the blower down to run pump gas. Being F2 might be hard keeping boost at a decent level. You could always install a boost controller and spin the blower adjusting where you need it. Heat is going to be the enemy with 93 octane i would use water injection. I don't know if anything has changed but using alky injection with carb creates a rich condition as there is no way to adjust A/F ratio. Next issue will be the #250 valve springs it really depends on the cam specs. I would prefer #800 open pac has some dual springs that can do this. Since it's mostly street the cam lobe needs to be of softer design. With Boost I like spring pressures a little higher than what cam calls for plus compensating for wear that effects spring pressure. As for the heads 205 is a little small on the volume to make decent N/A power using small cam and low compression. I've seen places take the 225s to around 245 cc. I would think the 205 would have enough meat to open the intake some. It would be more cost effective cleaning up the AFR head and get the right springs instead of buying TEA. Someone that could work on those AFRs would be pandhandle performance. Bennett sells 16 ferrea 1000s around $300 and you don't need them on the intake side. I would keep compression low probably around 8 with pump gas. If it was me i would use EFI with two tunes and a boost controller. One for streetpump gas and C16 on the strip to obtain your goals.
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