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Forum: Do It Yourself, Boating on a Budget

05-06-2026, 07:03 AM

Replies: 18

489 build sheet?

Views: 824

Posted By THUNDERBOLT19

so scrap the idea of 088 heads and look for a set...

so scrap the idea of 088 heads and look for a set of 049's?

Forum: Do It Yourself, Boating on a Budget

05-06-2026, 07:02 AM

Replies: 18

489 build sheet?

Views: 824

Posted By THUNDERBOLT19

so scrap the idea of 088 heads and look for a set...

so scrap the idea of 088 heads and look for a set of 049's?

Forum: Do It Yourself, Boating on a Budget

05-04-2026, 02:00 PM

Replies: 18

489 build sheet?

Views: 824

Posted By THUNDERBOLT19

gm 088 heads 525 spec marine cam -18cc...

gm 088 heads

525 spec marine cam

-18cc dome SRP pistons

should be around 9.4 to 1 compression

Forum: Do It Yourself, Boating on a Budget

04-27-2026, 07:45 PM

Replies: 10

489 Stroker

Views: 799

Posted By THUNDERBOLT19

interested, will reach out

interested, will reach out

Forum: Do It Yourself, Boating on a Budget

04-24-2026, 08:19 PM

Replies: 18

489 build sheet?

Views: 824

Posted By THUNDERBOLT19

489 build sheet?

Looking for anyone that’s built a 489. Have a 454 that’s 0.030” over with 4.25” scat crank and rods. Need to figure out pistons/heads/cam. Looking for any help to point me in right direction.

I...

Forum: Do It Yourself, Boating on a Budget

04-03-2026, 03:52 PM

Replies: 10

489 Stroker

Views: 799

Posted By THUNDERBOLT19

I can get a good deal on gm 088 heads locally but...

I can get a good deal on gm 088 heads locally but not sure if they’ll be sufficient enough to reach my hp goals. The heads I can get locally have new valves and valve job done by machine shop. Ready...

Forum: Do It Yourself, Boating on a Budget

04-03-2026, 01:41 PM

Replies: 10

489 Stroker

Views: 799

Posted By THUNDERBOLT19

489 Stroker

I have a 489 BBC to replace my blown 516. I would like to reuse the cam from 516 if possible.
275/284 112lsa (Isky 39627584)
Holley 850
Dart Single plane intake

trying to decide what heads to...

Forum: Do It Yourself, Boating on a Budget

02-11-2026, 07:50 AM

Replies: 1

489 Stroker

Views: 564

Posted By THUNDERBOLT19

489 Stroker

I had a 502 0.060" over that dropped a valve and destroyed the head & block. Had a hard time finding a replacement 502 block. So I found a brand new Generac 489 engine locally with scat rotating...

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