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  1. #1
    427
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    Default Old school Fuellie heads

    With all the alloy heads around, was just wondering how hard it would be to hit the 450 hp mark on a 350/383 with Fuellie heads and a hyd roller on 98. First issue would be runner size i assume..

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    Depends on which fuelies. A pair of 292's should do it easily, then maybe a pair of 041/186 off a Z28 302 or LT1 with other good stuff should do it easily especially with 377+ ci. 1969 Z28 engines are reported to exceed 400hp on a dyno at silly rpm. With modern roller cams and an extra 75ci you should do it easy at lower rpm. Only question is why as the vintage heads will cost a bomb to begin with plus mods, for the same $ you'll get superior alloy heads or even cheap Vortecs that will do it better.

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    Do you ever leave? EH179's Avatar
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    By the time you port the old double humps or turbo heads, the outlay would buy new heads with much more potential.

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    I just read a Super Chevy article on a 302 simply for comparison. They got 357hp @6700rpm out of a 1969 Z28 302. That is 2.02/1.6 1969 fuelies (186 casting), Duntov solid cam, alloy high rise and 780cfm Holley.

    Changing to a Comp cams roller (specs 0.640/0.621 lift split, a 256/260-degree duration split (at 0.050) and a tight 107-degree lobe separation), AFR heads (210cc Eliminator), Procomp hi rise single plane, 750 HP Holley and MSD ignition they achieved 519 hp at 7,400 rpm and an even 400 lb-ft of torque at 6,300 rpm.

    Shows you that even on a 302 modern heads and cam really make a difference. And also shows if a dead stock 302 pulls 360 odd hp then a 377-383 with the same heads, modern cam and suitable intake/carb should see your 450hp goal pretty close.

  5. #5
    427
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    Thanks boys. I find these comparisons very interesting. I have 461 ported fuellies and a hyd roller in the 230's on my 350. Had them laying around so i uesd them. When the car runs i guess i will find out. Always thought the runner size was restrictive..

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    The 327 375 horse factory engine had 461 or 462 heads,, so with extra cubes & some modernisation I think 450 will be a cakewalk

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    Hi
    If you port a set of collectable castings I imagine they loose value . There are strictly only worth $ to a numbers correct rebuild . By the time u do a FULL reco it would be more cost effective for a set of aftermarket heads $per hp wise .

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    Quote Originally Posted by 427 View Post
    Thanks boys. I find these comparisons very interesting. I have 461 ported fuellies and a hyd roller in the 230's on my 350. Had them laying around so i uesd them. When the car runs i guess i will find out. Always thought the runner size was restrictive..
    Years ago I tidied up an old combo, 350 with a small 240 @ 050 solid and a pair of ported 461's. With 3500rpm stall it would light tyres everywhere in my old HQ Tonner and would run low 12's all day, even ran a couple of 11.9's.

    I later fitted a pair of aftermarket 200cc intake runner heads, 10 bigger cam, more stall etc and ran low 11's but it never had the off idle response the little fuellie heads had !

    Don't panic, what you have will be a bit of fun !

  9. #9
    427
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    Thanks mate. Exactly what i wanted to hear! I also tried 200cc heads years ago but like you said Struggler, off idle response suffered. Bigger aint always better!

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    Quote Originally Posted by struggler View Post
    Years ago I tidied up an old combo, 350 with a small 240 @ 050 solid and a pair of ported 461's. With 3500rpm stall it would light tyres everywhere in my old HQ Tonner and would run low 12's all day, even ran a couple of 11.9's.

    I later fitted a pair of aftermarket 200cc intake runner heads, 10 bigger cam, more stall etc and ran low 11's but it never had the off idle response the little fuellie heads had !

    Don't panic, what you have will be a bit of fun !
    Totally agree, have fun with what you have. I have an old SBC in the shed with Cast Iron Dart 2 heads.
    Not even considering updating to alloy heads when I rebuild it. There will be more than enough power for street and strip duties...........

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    I have a set of 292s on a 383 in a hx ute ute, ran 11.0 @ 123mph with an old dinosaur cam and powerglide. always wanted to build new engine with these heads and try a new modern cam and give it a bit of comp and see how they go.

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    The Dart heads are a copy of the 292's from memory. 292's are pretty serious versions of the cast iron SBC heads though: angle plug, big runner, no exhaust crossover, big valve, big spring area etc. Most US blokes reckon Vortec cast iron heads will outdo them though. I have a pair of 292's here that I think were Crane Fireball versions, plus have a pair of stock 292's. The Crane modded versions have huge ports, almost BBC like.

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    true, the first Brodix alloy heads, were copies they even had the single tall hump on the front like the 292s

  14. #14
    427
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    Cast iron lives again. Just like vinyl!..

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    Vortech heads have proved time and time again to be the best factory cast head for a Chev. There are heaps of them and are cheap brand new.

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