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477 "Simple" Build

22K views 27 replies 10 participants last post by  Fordee 
#1 · (Edited)
We just finished up the dyno session on a 477 build for a friends 78 Fairmont yesterday. Very informitive session as we ran this engine the better part of 20 or so runs, mainly trying out some different intakes. We started off with a untouched Offy T/Ram with two 650DP Holleys and then switched to a TFS Mafia intake. Bigger carbs would surely have helped but thats all we had to use. I did try out my Offy single top plenum and it was worth around 20HP more than the twin top and no loss of TRQ. My top was ran with a 1050CFM Dom. The intake was then switched over to a new 'out of the box' TFS Mafia intake, with a TFS 1" spacer, and a 1050CFM Dom and thats what this combo seemed to prefer although we had to spin the eng more RPM. The dyno sheet I posted is the most conservitive pull with the TFS intake because no stud girdle was installed. We did spin to 6900 & 7000RPM and the eng responded to the tune of 687HP. The build is as follows: D1VE block(sonic checked), early 2Y crank, PEP H beam rods, SRP 'flat top" pistons, JE rings, Oregon Cams ground flat tappet solid cam (260/266@.050 110*L/Sep) Crower Cool Face lifters, Crower .120 wall P/Rods, Crower Stainless 1.73 Rockers, Isky V/Springs, & Ti Retainers. The comp. ratio worked out to 12.2 and VP110 fuel was used. 34* of timing seemed to be what worked the best. The heads were opened to CJ size on the Int. runner and bowl blended. All in all a straight forward combo with a tick over $5K wrapped in it....................
 

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#11 ·
The headers used were Hooker Fox swap peices(2"prim, 3.5" coll, not sure on the prim, tube length off the top of my head)...............
Those headers work very well
 
#12 ·
It's not together yet because I'm still working on the car. Using flattops, a Victor intake, TFS CJ heads, and 1 7/8" Hookers for now (because I have them). Using solid cam with a bit more duration and a bigger split.....Probably will end up using a Dominator and going to 2" headers. Going to try different intakes to see what is quicker in the car. Still working on the heads and have been working on a Port-o-sonic to try out against the Victor and a TFS intake like the one you are running. Then will end up running a stroker of some kind eventually like everyone else....lol.....D
 
#14 ·
On the POS I am trying to port it as much as possible and do CJ port match. Opening up the carb flange and plenum....and thinking of doing up a HVH 4500 adapter like I saw on an EMC engine years ago....Porting the heads and need to flow them and see how they are doing (until I am happy), which is never....lol. The Victor is a 4150 flange as well....not sure how I will address the flange on that one, although it is the same as a 4500 version. Just need to redrill it....might just use it like it is at first with my 4150 1050 to get it running and then go from there. The car is just giving me so much work to get back together, I have not had time to finish up all of the engine work yet........Keep us posted on your progress.....I sure like the heads you are running....D
 
#19 ·
Update

My friend got atleast one outing with the Fairmont this last summer. Hes been bogged down with work so hes going to get a roll bar installed this winter and some better rear tires. The car ran some 10.90's in full street trim(Nitto drag radials 275/60 full exh etc)@ a 130MPH. Definetly some potential for mid-low 10's! The transbrake has yet to be used. All in all he was very happy especially since he drove the car to and from the track(30 mile round trip)............
 

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#22 · (Edited)
build

ran across this build very close to mine. dove block zero decked flattops 0.030 3.85 eagle crank scat h beam rods tfs 290 heads with some port work not going to post all the numbers at .600 int was 328 now 345 exh at .600 was 212 now 236 a little better, cam is a solid lifter custom ground 110 with 266/272 dur and .658/.678 lift heads were milled .030 also comp should be close to 13.1 tfs 4150 style intake with a custom built quick fuel 1050 not sure where the timing will end up started at 28 toasted the trany before we got any real times on the combo c6 4000 stall 4.57 gear 295/55/15 mt drag radials at 3900 pounds street car looking for some 10 sec passes we will see. forgot the biggest limiter for me is the 1 7/8 headers unless I want no power steering. anyone got a hp guess for my combo
 
#23 ·
cam

this was from your previous post
The Cyl head flow; INT: .500"=338cfm .600=353cfm .700=366cfm The cam is 260*INT/266*EXH @ .050" ground on a 110* Lobe Seperation Net lift worked out @ .653INT/.686

the dyno sheet shows that you posted with the results 651/665 for cam.
these are fully ported tfs head flow numbers

.100=70/58
.200=153/110
.300=231/154
.400=295/187
.500=335/219
.600=358/240
.700=367/251
.750=370/256
Just a little confused on which cam was used and if the heads were fully ported and polished
just as a comp tfs 325 heads flow .500-343 .600-370 .700-389
 
#24 ·
Ported.............

Yes the heads were ported. The INT side was opened to CJ size from the int side to within a inch of the short turn, and the EXH runner was just cleaned up lightly. The camshaft used on the dyno is what I had posted for specs(SFT 260*/266* @.050).
 
#25 ·
ok

Thanks, I was confused as to what the combo on the dyno was, I hope with any luck to crack the 650hp range and have the torque that you showed in you results cause I was thinking maybe 560-575 for torque so if its better than that I will be very happy. Thanks for the reply
Thanks,
Steve
 
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