What's the biggest you can go without machining?

[bigedd08]

I have a stock 1600DP with Dual Weber 34 ICTs. What is the biggest I can go without machining the heads. 1641, 1776... I thought it was 1641, but I'm not sure.

I am getting ready to order a rebuild kit withe everything except the heads. I've seen a 1641 kit in cip1 catalog I am thinking of pairing with an Engle 110 cam.

Your input is welcome......

-Ed
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69 Fastback Automatic

[blankmange]

[SquareTone]

If you don't want to machine then I'd stick with the 1600's. I had the 1641 for a while, and couldn't tell any difference. I've heard that the smallest stroker crank will go with no modification. Might be worth considering.

[karfer67]

i think the largest stroker you could use would be a 74mm vs the stock 69mm. personally i would not use the "slip in" big bore pistons as the reason they are able to do this is the cylinder walls are machined thiner. this makes them run hotter and over time can warp. where as a stock bore has thick barels and runs much much cooler. it really comes down to if you want an engine that will last 100,000 miles or an engine that will last 50,000 and have maybe 5 more hp.
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aircooled for life (1972 squareback cal look)

[quattlebum]

I would bore if you're going to do a 1641 like Karfer said the walls are thinner... i've driven one, I don't notice that much of a diff between the 1600 and 1641... there's a good difference between a 1600 and 1776...

[localboy]

1776...nuff said.
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[FASTBACKDON]

I agree with kafer and mark there is a big differance between my stock 1600 and my mild 1776 ha ha the carbs i switched to help a little good luck