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getting a few more ponies out of a 70 johnson
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<blockquote data-quote="Lil&#039; Blue Rude" data-source="post: 340387" data-attributes="member: 4627"><p>Since it's a 88 it could be a 49 or 56 cube motor. 56 started in 86 and 49 eneded in 88 so they over lapped 2 years. 49 you could match to 75hp porting but the 56 is a different block, but you could match it to the sst60 porting. should make around 90hp then. Compression helps. Porting will lose bottom end but makes big power on top. add finger ports and gain llow,mid, and in some cases top end. But it does make them pull a lot harder through bottom and mid range. You could also make a sst60 style exhaust tuner for it too.</p></blockquote><p></p>
[QUOTE="Lil' Blue Rude, post: 340387, member: 4627"] Since it's a 88 it could be a 49 or 56 cube motor. 56 started in 86 and 49 eneded in 88 so they over lapped 2 years. 49 you could match to 75hp porting but the 56 is a different block, but you could match it to the sst60 porting. should make around 90hp then. Compression helps. Porting will lose bottom end but makes big power on top. add finger ports and gain llow,mid, and in some cases top end. But it does make them pull a lot harder through bottom and mid range. You could also make a sst60 style exhaust tuner for it too. [/QUOTE]
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getting a few more ponies out of a 70 johnson
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