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The Terminator
Turbo Cobras
Debating on single or twin
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<blockquote data-quote="tt335ci03cobra" data-source="post: 15581646" data-attributes="member: 68944"><p>If you'll keep the long block stock, get a set of arp studs and some decent head gaskets to keep it together.</p><p></p><p>A single 76 with an 80 hotside will have the flow for 800whp at about 18-19psi with a very nice high flowing system.</p><p></p><p>Twin 58/60's would also work well.</p><p></p><p>It's best to build up the head/cam combo and freshen the longblock with a nice 9.3-9.8/1 piston (for a pump gas car don't go much higher). These engines are 14 years old now so rings and valvetrain do get past their prime. I feel safer running lower boost on a stronger/more efficient engine than higher boost on an older good but stock engine.</p><p></p><p>I put 800whp down with pump gas running 9.3/1 compression through 62's by building the heads and cams fully. I'm running a hair less than 12psi. A previous twin 57 combo with a custom cold side and stock 4.6 longblock made 756whp on 15psi with a Sullivan intake and pretty choked exhaust.</p><p></p><p>Tuning is crucial as is cooling and fuel. To do a reliable 800whp pump gas car isn't very cheap or quick process unless you're very handy.</p><p></p><p>Thing is, unless you have built suspension and matching electronics to optimize acceleration for the first 330ft, you won't be much faster than a 650-700whp setup. It's much easier to build a 650-700whp pump car, and then run 110 for 800whp.</p><p></p><p>Just going from experience, these builds get pricey when you try to make reliable hp on pump gas. </p><p></p><p>Kit wise, single is easier to make custom. Twins are more involved, but Caleb from CGfab has a great header and down pipe. Cold sides are pretty easy either way. Don't go too big on the intercooler, and try to switch a Lincoln mk8 fan from 93-98 in. They work great.</p></blockquote><p></p>
[QUOTE="tt335ci03cobra, post: 15581646, member: 68944"] If you'll keep the long block stock, get a set of arp studs and some decent head gaskets to keep it together. A single 76 with an 80 hotside will have the flow for 800whp at about 18-19psi with a very nice high flowing system. Twin 58/60's would also work well. It's best to build up the head/cam combo and freshen the longblock with a nice 9.3-9.8/1 piston (for a pump gas car don't go much higher). These engines are 14 years old now so rings and valvetrain do get past their prime. I feel safer running lower boost on a stronger/more efficient engine than higher boost on an older good but stock engine. I put 800whp down with pump gas running 9.3/1 compression through 62's by building the heads and cams fully. I'm running a hair less than 12psi. A previous twin 57 combo with a custom cold side and stock 4.6 longblock made 756whp on 15psi with a Sullivan intake and pretty choked exhaust. Tuning is crucial as is cooling and fuel. To do a reliable 800whp pump gas car isn't very cheap or quick process unless you're very handy. Thing is, unless you have built suspension and matching electronics to optimize acceleration for the first 330ft, you won't be much faster than a 650-700whp setup. It's much easier to build a 650-700whp pump car, and then run 110 for 800whp. Just going from experience, these builds get pricey when you try to make reliable hp on pump gas. Kit wise, single is easier to make custom. Twins are more involved, but Caleb from CGfab has a great header and down pipe. Cold sides are pretty easy either way. Don't go too big on the intercooler, and try to switch a Lincoln mk8 fan from 93-98 in. They work great. [/QUOTE]
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